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Finding the Fourth Proportional to 678.38, 1,018.37 and 332.00

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Solution

The fourth proportional to 678.38, 1,018.37 and 332.00 is: 498.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.38 : 1,018.37 = 332.00 : x
  2. Step 2: Convert to fraction form
    678.38/1,018.37 = 332.00/x
  3. Step 3: Cross multiply
    678.38x = 1,018.37 × 332.00
  4. Step 4: Simplify right side
    678.38x = 338,098.40
  5. Step 5: Solve for x
    x = 338,098.40/678.38
  6. Step 6: Final answer
    x = 498.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.